Abstract: A liquid discharge head includes: a plurality of recording element boards each having a plurality each of discharge orifices configured to discharge liquid, liquid supply channels configured to supply liquid to the discharge orifices, and liquid recovery channels configured to recover liquid supplied from the liquid supply channels; a common supply channel communicating with at least one liquid supply channel of the recording element boards and configured to supply liquid to the plurality of recording element boards; and a common recovery channel communicating with at least one liquid recovery channel of the recording element boards and configured to recover liquid from the plurality of recording element boards.

Abstract: A liquid ejection head capable of suppressing a change in pressure of a pressure chamber, a liquid ejection apparatus, and a manufacturing method are provided. For that reason, a lid member is formed on a wafer-shaped element board and the element board is cut into chips to manufacture a print element board.

Abstract: A liquid ejection apparatus using a liquid ejection head and ejecting a liquid from the liquid ejection head includes a liquid supply unit that has a supply passage of the liquid supplied to the liquid ejection head and a collection passage of the liquid collected from the liquid ejection head, and supplies and collects the liquid by generating a difference between a pressure of the liquid in the supply passage and a pressure of the liquid in the collection passage, and a flow resistance adjustment unit provided in the supply passage and/or the collection passage.

Abstract: The liquid ejection apparatus includes a circulation unit configured to circulate a liquid along a circulation passage extending from a liquid supply source to the liquid supply source through a liquid ejection head. Further, the liquid ejection apparatus includes a deaeration unit configured to perform a deaeration operation of decreasing a dissolved gas amount of the liquid, a recovery unit configured to recover ejection performance of an ejection opening, and a control unit configured to control an operation of driving the circulation unit and the deaeration unit. The control unit starts the deaeration operation and circulates the liquid having been deaerated by the deaeration operation inside a circulation path after the recovery operation and before an initial printing operation after the recovery operation.

Abstract: A liquid discharge head includes discharge orifices, recording elements that generate energy, supply channels that supply liquid to the recording elements, a common supply channel communicating with the supply channels, recovery channels that recover liquid supplied to the recording elements, a common recovery channel that recovers liquid from the recovery channels, a first inlet port that supplies liquid to the common supply channel, a first recovery port that recovers liquid from the first common supply channel, a second inlet port that supplies liquid to the common recovery channel, and a second recovery port that recovers liquid from the second common recovery channel. The first inlet port and the first recovery port communicate without going through channel portions where recording elements are disposed, and the second inlet port and the second recovery port communicate without going through channel portions where recording elements are disposed.

Abstract: In a printing apparatus including a circulation system circulating a liquid, a volatile component included in the liquid evaporates from an ejection opening and thus characteristics of the liquid involving with concentration or viscosity change. The invention provides a printing apparatus that uses a liquid ejection head including an ejection opening ejecting a liquid, a print element generating energy for ejecting a liquid, and a pressure chamber having the print element provided therein, the printing apparatus including: a circulator configured to circulate the liquid so that the liquid passes through the pressure chamber; and a concentration adjustment unit configured to adjust a concentration of a liquid inside a liquid circulation system by discharging the liquid from the inside of the liquid circulation system and replenishing the liquid into the liquid circulation system from the outside of the liquid circulation system in response to the amount of the discharged liquid.

Abstract: In a printing apparatus including a circulation system circulating a liquid, a volatile component included in the liquid evaporates from an ejection opening and thus characteristics of the liquid involving with concentration, viscosity and the like change. The invention provides a printing apparatus including: a page wide type liquid ejection head that includes an ejection opening ejecting a liquid, a print element generating energy for ejecting a liquid, and a pressure chamber having the print element provided therein; a cap that covers the ejection opening; and a circulator configured to circulate the liquid so that the liquid passes through the pressure chamber, wherein a circulation of the liquid is started after the cap is opened and the circulation of the liquid is stopped in a case where an image forming operation of ejecting the liquid from the ejection opening on the basis of a job is ended.

Abstract: A first passage layer is provided with a plurality of supply passages each communicating with one portion of each of a plurality of pressure chambers and a plurality of collection passages each communicating with the other portion of each of the plurality of pressure chambers. A second passage layer is provided with a common supply passage communicating with the plurality of supply passages and a common collection passage communicating with the plurality of collection passages.

Abstract: A liquid ejection head includes first and second recording element boards having recording elements for generating energy to be utilized for ejection of liquid, first and second support members for respectively supporting the first and second recording element boards, and a flow channel forming member carrying thereon the first and second support members arranged side by side. The edge of the first recording element board located at the side of the second recording element board projects toward the second recording element board from the edge of the first support member located at the side of the second support member.

Abstract: A liquid discharge head includes discharge orifices, recording elements that generate energy, supply channels that supply liquid to the recording elements, a common supply channel communicating with the supply channels, recovery channels that recover liquid supplied to the recording elements, a common recovery channel that recovers liquid from the recovery channels, a first inlet port that supplies liquid to the common supply channel, a first recovery port that recovers liquid from the first common supply channel, a second inlet port that supplies liquid to the common recovery channel, and a second recovery port that recovers liquid from the second common recovery channel. The first inlet port and the first recovery port communicate without going through channel portions where recording elements are disposed, and the second inlet port and the second recovery port communicate without going through channel portions where recording elements are disposed.

Abstract: A liquid ejection apparatus of the invention is a liquid ejection apparatus including a liquid storage container that stores liquid, a circulation mechanism that circulates liquid in a circulation path, and a liquid ejection head fluidly-connected to the liquid storage container, the liquid ejection head having a plurality of ejection openings, wherein the liquid ejection head includes at least a pair of common passages and a plurality of individual passages that connect one of the pair of common passages to the other one of the pair of common passages and communicate with the plurality of ejection openings, respectively, and at least a pair of pressure adjustment mechanisms whose pressures are set to different control pressures is connected to respective upstream sides or downstream sides of the pair of common passages.

Abstract: A discharge port array is inclined to a second direction B at an angle ? that satisfies a relation of tan ?=d2/(N×d1), where d1 is a distance between discharge ports within the discharge port array in the second direction B, and d2 is a distance between two adjacent discharge ports within each group in a first direction.

Abstract: A first passage layer is provided with a plurality of supply passages each communicating with one portion of each of a plurality of pressure chambers and a plurality of collection passages each communicating with the other portion of each of the plurality of pressure chambers. A second passage layer is provided with a common supply passage communicating with the plurality of supply passages and a common collection passage communicating with the plurality of collection passages.

Abstract: Provided is a liquid ejection head comprising: an ejection opening row along a first direction; a pressure chamber with print-element; a passage communicating with the pressure chamber; a supply opening row along the first direction with supply openings extending in a second direction to supply liquid to the passage; a collection opening row along the first direction with collection openings extending in the second direction to collect a liquid from the passage; a first common supply passage along the first direction to supply a liquid to the supply opening row; a first common collection passage along the first direction to collect a liquid from the collection opening row; a first supply side communication opening extending in the second direction to supply a liquid to the first common supply passage; and a first collection side communication opening extending in the second direction to collect a liquid from the first common collection passage, wherein at least one of the first supply side communication openi

Abstract: A liquid discharge apparatus has a liquid discharge head having a recording element board that includes a plurality of discharge orifices configured to discharge liquid, a plurality of pressure chambers internally provided with a recording element configured to generate energy used to discharge liquid, the plurality of pressure chambers each communicating with the plurality of discharge orifices via discharge channels, a liquid supply channel configured to supply liquid to the plurality of pressure chambers, and a liquid recovery channel configured to recover liquid from the plurality of pressure chambers, and a tank configured to store liquid supplied to the liquid discharge head. The plurality of pressure chambers communicate between the liquid supply channel and the liquid recovery channel so that liquid flows through the plurality of pressure chambers, and the specific permittivity ?r of the liquid stored in the tank satisfies the relationship of ?r?65.

Abstract: A supporting member includes a first supporting portion disposed on a first and second recording element substrate side, and a second supporting portion disposed on a side opposite to the first and second recording element substrate side with respect to the first supporting portion, the first supporting portion includes a first individual flow path for supplying liquid to a first recording element substrate, and a second individual flow path for supplying liquid to a second recording element substrate, and the second supporting portion includes a common flow path for supplying liquid to the first and second individual flow paths.

Abstract: An ink jet recording method is provided for recording an image by ejecting an ink from a recording head including a member defining an ejection orifice through which the ink is ejected, an ejection element configured to generate an energy used for ejecting the ink, and a first flow path communicating with a portion between the ejection orifice and the ejection element. The method includes ejecting an ink through the ejection orifice, and moving the ink from the first flow path to the portion between the ejection orifice and the ejection element separately from the ejecting of the ink. In this method, the ink is an aqueous ink containing a coloring material and a compound containing a chain hydrocarbon having a carbon number of 8 or more to 18 or less substituted by a hydroxy group or an anionic group.

Abstract: A liquid discharge device to perform recording by use of a liquid discharge head including discharge ports to discharge a liquid, pressure generation elements to generate energy to be used to discharge the liquid, and pressure chambers communicating with the discharge ports. The liquid discharge device includes: a control unit to control a temperature of the liquid discharge head by applying heat with heating elements arranged in divided areas of a region of the liquid discharge head where the discharge ports are arranged. When there is recording data for the discharge port in a certain one of the divided areas, the control unit causes the heating element in the divided area to generate heat, and when there is no recording data for the discharge port in the certain divided area, the control unit keeps the heating element in the certain divided area from generating heat.

Abstract: In order that the interior of a cap member, in a case where the cap member abuts to a cover member, is allowed to have improved airtightness so that the cap member can sufficiently function, a sealing member is used to seal between the cover member and first and second flow path members for retaining the cover member.

Abstract: A liquid ejecting apparatus has a liquid ejecting unit and a negative pressure regulating unit provided between passages connecting the tank to the liquid ejecting unit, regulates fluid pressure of liquid flowing into the liquid ejecting unit. The negative pressure regulating unit includes a negative pressure chamber whose internal pressure is regulated within a predetermined range, and a discharging passage for discharging liquid stored in the negative pressure chamber from the negative pressure regulating unit. The discharging passage has an outlet disposed in an upper portion of the negative pressure chamber in a direction of gravity, a bubble accumulation portion connected to the outlet and having a space above the outlet in the direction of gravity, and a passage guiding liquid flowing from the outlet to a discharging port opened in a bottom of the negative pressure regulating unit.